Tìm số mũ n, biết : A 6 mũ n =36 B 10 mũ n = 10 000 000 C 3 . 3 mũ n=243 D 2 mũ 2 . 2 mũ n =128

`a)6^n=36`

`=>6^n=6^2`

`=>n=2`

Vậy `n=2`

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`10^n=10000000`

`=>10^n=10^7`

`=>n=7`

Vậy `n=7`

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`c)3 .  3^n =243`

`=> 3^(n+1)=3^5`

`=>n+1=5`

`=>n=5-1`

`=>n=4`

Vậy `n=4`

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`d)2^2 . 2^n =128`

`=> 2^(2+n)=2^7`

`=>2+n=7`

`=>n=7-2`

`=>n=5`

Vậy `n=5`

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